9987787738 has 8 divisors (see below), whose sum is σ = 14993026740. Its totient is φ = 4990112160.

The previous prime is 9987787729. The next prime is 9987787751. The reversal of 9987787738 is 8377877899.

9987787738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6817309489 + 3170478249 = 82567^2 + 56307^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1887553 + ... + 1892836.

Almost surely, 2^9987787738 is an apocalyptic number.

9987787738 is a deficient number, since it is larger than the sum of its proper divisors (5005239002).

9987787738 is a wasteful number, since it uses less digits than its factorization.

9987787738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3781712.

The product of its digits is 298722816, while the sum is 73.

The square root of 9987787738 is about 99938.9200361901. The cubic root of 9987787738 is about 2153.5573154141.

The spelling of 9987787738 in words is "nine billion, nine hundred eighty-seven million, seven hundred eighty-seven thousand, seven hundred thirty-eight".